Am I figuring this right?
#1
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Am I figuring this right?
Comp xer 220 224 114 +4
AFR 205s milled .018
Cometic .040
Stock block and pistons
I get SCR of 11.08:1
DCR 8.83:1
Quench .034
So my concern is; should this be OK on 93 Octane or am I going to have trouble in the warmer weather?
AFR 205s milled .018
Cometic .040
Stock block and pistons
I get SCR of 11.08:1
DCR 8.83:1
Quench .034
So my concern is; should this be OK on 93 Octane or am I going to have trouble in the warmer weather?
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I got 11.18 and 8.4
220 intake
224 exhaust
114 LSA
110 ICL
3.9 bore
3.622 stroke
0 piston relief
-.006 piston out of hole
63 cc head chambers (66 CC base - 3 cc mill(.006 per cc/.018 mill)
.040 gaskets
220 intake
224 exhaust
114 LSA
110 ICL
3.9 bore
3.622 stroke
0 piston relief
-.006 piston out of hole
63 cc head chambers (66 CC base - 3 cc mill(.006 per cc/.018 mill)
.040 gaskets
Last edited by brad8266; 01-08-2007 at 08:15 PM.
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Originally Posted by DaddySS
I like your numbers better!
Should run much less chance of knock at 8.4 on 93 Octane - yes?
Should run much less chance of knock at 8.4 on 93 Octane - yes?
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Originally Posted by DaddySS
I like your numbers better!
Should run much less chance of knock at 8.4 on 93 Octane - yes?
Should run much less chance of knock at 8.4 on 93 Octane - yes?
Hammer
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Originally Posted by DaddySS
Thanks gang...how confident are you guys in calculations?
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from the same calculator you have.
0.006 0.050 0.200
Intake Duration - ID (first number) 283 220 155
Exhaust Duration - ED (second number) 291 224 163
Lobe Center Angle - LCA (also known as LSA) 114 114 114
Intake Centerline - ICL (LSA - degrees of advance e.g. 114+2 = 112) 110 110 110
Intake Valve opens - IVO 31.5 0 -32.5 BTDC (- indicates ATDC)
Intake Valve closes - IVC 71.5 40 7.5 ABDC
Exhaust Valve Opens - EVO 83.5 50 19.5 BBDC
Exhaust Valve Closes - EVC 27.5 -6 -36.5 ATDC (- indicates BTDC)
Exhaust Centerline - ECL 118 118 118
Overlap 59 -6 -69 degrees
Bore 3.9
ST = Stroke 3.622
RL = Rod Length 6.098
Number of cylinders 8
Deck Height (how much pistons come out of the hole) -0.006
Piston Dome or Dish (- for a dome + for a dish) 0
Compressed Head gasket thickness 0.04
Cylinder Head Chamber Volume 63
Static Compression Ratio 11.18 :1
Dynamic Compresion Ratio 8.40 :1
Rod to Stroke Ratio 1.68 :1
Bore to Stroke Ratio 1.08 :1
0.006 0.050 0.200
Intake Duration - ID (first number) 283 220 155
Exhaust Duration - ED (second number) 291 224 163
Lobe Center Angle - LCA (also known as LSA) 114 114 114
Intake Centerline - ICL (LSA - degrees of advance e.g. 114+2 = 112) 110 110 110
Intake Valve opens - IVO 31.5 0 -32.5 BTDC (- indicates ATDC)
Intake Valve closes - IVC 71.5 40 7.5 ABDC
Exhaust Valve Opens - EVO 83.5 50 19.5 BBDC
Exhaust Valve Closes - EVC 27.5 -6 -36.5 ATDC (- indicates BTDC)
Exhaust Centerline - ECL 118 118 118
Overlap 59 -6 -69 degrees
Bore 3.9
ST = Stroke 3.622
RL = Rod Length 6.098
Number of cylinders 8
Deck Height (how much pistons come out of the hole) -0.006
Piston Dome or Dish (- for a dome + for a dish) 0
Compressed Head gasket thickness 0.04
Cylinder Head Chamber Volume 63
Static Compression Ratio 11.18 :1
Dynamic Compresion Ratio 8.40 :1
Rod to Stroke Ratio 1.68 :1
Bore to Stroke Ratio 1.08 :1
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Originally Posted by brad8266
from the same calculator you have.
0.006 0.050 0.200
Intake Duration - ID (first number) 283 220 155
Exhaust Duration - ED (second number) 291 224 163
Lobe Center Angle - LCA (also known as LSA) 114 114 114
Intake Centerline - ICL (LSA - degrees of advance e.g. 114+2 = 112) 110 110 110
Intake Valve opens - IVO 31.5 0 -32.5 BTDC (- indicates ATDC)
Intake Valve closes - IVC 71.5 40 7.5 ABDC
Exhaust Valve Opens - EVO 83.5 50 19.5 BBDC
Exhaust Valve Closes - EVC 27.5 -6 -36.5 ATDC (- indicates BTDC)
Exhaust Centerline - ECL 118 118 118
Overlap 59 -6 -69 degrees
Bore 3.9
ST = Stroke 3.622
RL = Rod Length 6.098
Number of cylinders 8
Deck Height (how much pistons come out of the hole) -0.006
Piston Dome or Dish (- for a dome + for a dish) 0
Compressed Head gasket thickness 0.04
Cylinder Head Chamber Volume 63
Static Compression Ratio 11.18 :1
Dynamic Compresion Ratio 8.40 :1
Rod to Stroke Ratio 1.68 :1
Bore to Stroke Ratio 1.08 :1
0.006 0.050 0.200
Intake Duration - ID (first number) 283 220 155
Exhaust Duration - ED (second number) 291 224 163
Lobe Center Angle - LCA (also known as LSA) 114 114 114
Intake Centerline - ICL (LSA - degrees of advance e.g. 114+2 = 112) 110 110 110
Intake Valve opens - IVO 31.5 0 -32.5 BTDC (- indicates ATDC)
Intake Valve closes - IVC 71.5 40 7.5 ABDC
Exhaust Valve Opens - EVO 83.5 50 19.5 BBDC
Exhaust Valve Closes - EVC 27.5 -6 -36.5 ATDC (- indicates BTDC)
Exhaust Centerline - ECL 118 118 118
Overlap 59 -6 -69 degrees
Bore 3.9
ST = Stroke 3.622
RL = Rod Length 6.098
Number of cylinders 8
Deck Height (how much pistons come out of the hole) -0.006
Piston Dome or Dish (- for a dome + for a dish) 0
Compressed Head gasket thickness 0.04
Cylinder Head Chamber Volume 63
Static Compression Ratio 11.18 :1
Dynamic Compresion Ratio 8.40 :1
Rod to Stroke Ratio 1.68 :1
Bore to Stroke Ratio 1.08 :1
DaddySS, my figures are right. 8.9 DCR is probably going to be a bit too aggressive. Did you already mill the heads?
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Originally Posted by pianoprodigy
Your durations at .006 are way off. It looks like you used the "DCR Manual Calculator" tab and only changed the durations at .050. The .006 durations you are using are for a G5X3.
DaddySS, my figures are right. 8.9 DCR is probably going to be a bit too aggressive. Did you already mill the heads?
DaddySS, my figures are right. 8.9 DCR is probably going to be a bit too aggressive. Did you already mill the heads?
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Originally Posted by brad8266
Where did I go wrong then? If you can help me out here that would be great because i am also using this calculator for my upcoming setup, which is in like a week or so.
Don't use the DCR Manual Calculator tab unless you aren't using Comp lobes.
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Originally Posted by pianoprodigy
See the instructions here: https://ls1tech.com/forums/showthread.php?t=630637
Don't use the DCR Manual Calculator tab unless you aren't using Comp lobes.
Don't use the DCR Manual Calculator tab unless you aren't using Comp lobes.
Last edited by brad8266; 01-09-2007 at 01:25 PM.
#14
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Originally Posted by pianoprodigy
Your durations at .006 are way off. It looks like you used the "DCR Manual Calculator" tab and only changed the durations at .050. The .006 durations you are using are for a G5X3.
DaddySS, my figures are right. 8.9 DCR is probably going to be a bit too aggressive. Did you already mill the heads?
DaddySS, my figures are right. 8.9 DCR is probably going to be a bit too aggressive. Did you already mill the heads?
AFR and I put this combo together after a big f13 cam mess. I was going for real strong low end torque and we thought with the 33 to 34 quench and about 11:1 compression it would be fine on 93 octane but this DCR concerns me.
So what are my choices here - bring the engine temp down (I am running a 180 stat), retard the cam, get a different cam, get it tuned and see how it runs in the warmer weather, ????
I have been tuning it myself but I have limited time to keep working the tune on the street.
Ideas?
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Originally Posted by DaddySS
Yes, heads milled, engine complete and running. It runs unbelieveably strong and with just a little bit of KR, interestingly enough only at about 4400 RPM and after closing the throttle and then reapplying at about 30% throttle.
AFR and I put this combo together after a big f13 cam mess. I was going for real strong low end torque and we thought with the 33 to 34 quench and about 11:1 compression it would be fine on 93 octane but this DCR concerns me.
So what are my choices here - bring the engine temp down (I am running a 180 stat), retard the cam, get a different cam, get it tuned and see how it runs in the warmer weather, ????
I have been tuning it myself but I have limited time to keep working the tune on the street.
Ideas?
AFR and I put this combo together after a big f13 cam mess. I was going for real strong low end torque and we thought with the 33 to 34 quench and about 11:1 compression it would be fine on 93 octane but this DCR concerns me.
So what are my choices here - bring the engine temp down (I am running a 180 stat), retard the cam, get a different cam, get it tuned and see how it runs in the warmer weather, ????
I have been tuning it myself but I have limited time to keep working the tune on the street.
Ideas?
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Originally Posted by brad8266
Thanks man, i got it right now. So how will I know my DCR if I dont know who ground my cam? I have a 231/237 .575 .575 112LSA. Are most cams ground with comp lobes?
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Originally Posted by DaddySS
Yes, heads milled, engine complete and running. It runs unbelieveably strong and with just a little bit of KR, interestingly enough only at about 4400 RPM and after closing the throttle and then reapplying at about 30% throttle.
AFR and I put this combo together after a big f13 cam mess. I was going for real strong low end torque and we thought with the 33 to 34 quench and about 11:1 compression it would be fine on 93 octane but this DCR concerns me.
So what are my choices here - bring the engine temp down (I am running a 180 stat), retard the cam, get a different cam, get it tuned and see how it runs in the warmer weather, ????
I have been tuning it myself but I have limited time to keep working the tune on the street.
Ideas?
AFR and I put this combo together after a big f13 cam mess. I was going for real strong low end torque and we thought with the 33 to 34 quench and about 11:1 compression it would be fine on 93 octane but this DCR concerns me.
So what are my choices here - bring the engine temp down (I am running a 180 stat), retard the cam, get a different cam, get it tuned and see how it runs in the warmer weather, ????
I have been tuning it myself but I have limited time to keep working the tune on the street.
Ideas?
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Originally Posted by pianoprodigy
That doesn't sound like a Comp grind to me. You can just guestimate on the durations at .006 (add 50 degrees to the duration) or you can have it Cam Doctored and get the exact specs.
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Originally Posted by brad8266
Thanks man, that puts my upcoming setup at 8.82 DCR
Might want to post up and ask if anyone can help you identify your grind.
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Originally Posted by pianoprodigy
Well, see that's where I might be a bit nervous. I'm not really familiar with other grinds. They could be a lot different than +50 and then your DCR could end up being way too high...
Might want to post up and ask if anyone can help you identify your grind.
Might want to post up and ask if anyone can help you identify your grind.